* src/reader.c (read-string): Handle \t. Fixex M1 output.
if (c == '\\' && peekchar () == '\\') p = append_char (p, getchar ());
else if (c == '\\' && peekchar () == '"') p = append_char (p, getchar ());
else if (c == '\\' && peekchar () == 'n') {getchar (); p = append_char (p, '\n');}
+ else if (c == '\\' && peekchar () == 't') {getchar (); p = append_char (p, '\t');}
#if !__MESC__
else if (c == EOF) assert (!"EOF in string");
#endif